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Jul 14, 2015
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Jul 14, 2015
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William H. Butler; Claudia K. A. Mewes; Chunsheng Liu; Tianyi Xu
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We present a rational approach to the design of halfmetallic heterostructures which allows the design of an infinite number of halfmetallic heterostructures. The wide range of materials that can be made halfmetallic using our approach makes it possible to engineer materials with tunable characteristic properties, for example low intrinsic magnetic damping, small magnetic moment or perpendicular anisotropy. We demonstrate the proposed design scheme for a series of transition metal...
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Source: http://arxiv.org/abs/1103.3855v1
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Apr 8, 2015
04/15
Apr 8, 2015
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S. AraujoBetancor; B. T. Gaensicke; K. S. Long; K. Beuermann; D. de Martino; E. M. Sion; P. Szkody
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We have obtained HST/STIS data for a total of eleven polars as part of a program aimed to compile a homogeneous database of highquality farultraviolet (FUV) spectra for a large number of cataclysmic variables (CVs). Of the eleven polars, eight were found in a state of low accretion activity (V347Pav, VVPup, V834Cen, BLHyi, MRSer, STLMi, RXJ1554.2+2721 and V895Cen) and three in a state of high activity (CDInd, ANUMa and UWPic). The STIS spectra of the lowstate polars unambiguously reveal the...
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Source: http://arxiv.org/abs/astroph/0412180v1
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Apr 8, 2015
04/15
Apr 8, 2015
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Michael L. Sitko; Lawrence S. Bernstein; Robert J. Glinski
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We have reanalyzed the ultraviolet spectrum of HD 44179, the central star(s) of the Red Rectangle nebula, providing improved estimates of the column density, rotational, and vibrational temperatures of the 4th Positive AX system of CO in absorption. The flux shortward of 2200 A is a complex blend of CO features with no discernible stellar photosphere, making the identification of other molecular species difficult, and the direct derivation of the dust extinction curve impossible. We confirm...
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Source: http://arxiv.org/abs/0802.2085v1
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Mar 15, 2015
03/15
Mar 15, 2015
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Mikhail I. Rabinovich; Mehmet K. Muezzinoglu
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We present a new paradigm in the study of brain mental dynamics on the basis of the stable transient activity neural networks observed in experiments. This new approach is in contrast to traditional system analysis usually adopted in cognitive modeling. Transient dynamics offers a sound formalism of the observed qualities of brain activity, while providing a rigorous set of analysis tools. Transients have two main features: First, they are resistant to noise, and reliable even in the face of...
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Source: http://arxiv.org/abs/0909.1144v1
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Jan 26, 2015
01/15
Jan 26, 2015
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Arkaitz Zubiaga; Damiano Spina; Enrique Amigó; Julio Gonzalo
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This paper explores the realtime summarization of scheduled events such as soccer games from torrential flows of Twitter streams. We propose and evaluate an approach that substantially shrinks the stream of tweets in realtime, and consists of two steps: (i) subevent detection, which determines if something new has occurred, and (ii) tweet selection, which picks a representative tweet to describe each subevent. We compare the summaries generated in three languages for all the soccer games in...
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Source: http://arxiv.org/abs/1204.3731v1
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Mar 28, 2014
03/14
Mar 28, 2014
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J. L. F. Barbon
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This is a rendering of a review talk on the state of String Theory, given at the EPS2003 Conference, intended for a wide audience of experimental and theoretical physicists. It emphasizes general ideas rather than technical aspects.
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Source: http://arxiv.org/abs/hepth/0404188v1
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Mar 2, 2014
03/14
Mar 2, 2014
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Roman Sverdlov
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The first goal of this paper is to show that discreteness, locality, and relativistic covariance can peacefully coexist if the ordinary spacetime (OST) is replaced with phase spacetime (PST) as a geometric background of a Poisson process, where PST is a spacetime generalization of a notion of phase space (this is a 7dimensional version of the 8dimensional structure proposed by Caianiello). Furthermore, Caianiello's idea of finite acceleration is implemented. After this is done, the paper then...
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Source: http://arxiv.org/abs/0910.2498v3
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Nov 7, 2013
11/13
Nov 7, 2013
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Andrei A. Galiautdinov; David R. Finkelstein
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The Dirac equation is not semisimple. We therefore regard it as a contraction of a simpler decontracted theory. The decontracted theory is necessarily purely algebraic and nonlocal. In one simple model the algebra is a Clifford algebra with 6N generators. The quantum imaginary $\hbar i$ is the contraction of a dynamical variable whose backreaction provides the Dirac mass. The simplified Dirac equation is exactly Lorentz invariant but its symmetry group is SO(3,3), a decontraction of the...
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Source: http://arxiv.org/abs/hepth/0106273v2
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Janardhan Iyengar; Bryan Ford
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The challenges of optimizing endtoend performance over diverse Internet paths has driven widespread adoption of inpath optimizers, which can destructively interfere with TCP's endtoend semantics and with each other, and are incompatible with endtoend IPsec. We identify the architectural cause of these conflicts and resolve them in Tng, an experimental nextgeneration transport services architecture, by factoring congestion control from endtoend semantic functions. Through a technique...
Source: http://arxiv.org/abs/0912.0921v1
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Aspects of the algebraic structure and representation theory of the quantum affine superalgebras with symmetrizable Cartan matrices are studied. The irreducible integrable highest weight representations are classified, and shown to be deformations of their classical counterparts. It is also shown that Jimbo type quantum affine superalgebras can be obtained by deforming universal enveloping algebras of ordinary (i.e., nongraded) affine algebras supplemented by certain parity operators.
Source: http://arxiv.org/abs/qalg/9612020v1
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A classical theorem of Scheunert on $G$color Lie algebras, asserts in the case of finitely generated abelian groups, one can twist the algebra structure and the commutation bicharacter on $G$ by a 2cocycle twist to a superLie $G$ graded, algebra. In this paper we show that this can be done for an arbitrary group.
Source: http://arxiv.org/abs/qalg/9703002v1
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John C. Baez; Laurel Langford
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Just as links may be algebraically described as certain morphisms in the category of tangles, compact surfaces smoothly embedded in R^4 may be described as certain 2morphisms in the 2category of `2tangles in 4 dimensions'. In this announcement we give a purely algebraic characterization of the 2category of unframed unoriented 2tangles in 4 dimensions as the `free semistrict braided monoidal 2category with duals on one unframed selfdual object'. A forthcoming paper will contain a proof of...
Source: http://arxiv.org/abs/qalg/9703033v4
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O. Babelon; M. Talon
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We compute the symplectic structure of the spin Calogero model in terms of algebrogeometric data on the associated spectral curve.
Source: http://arxiv.org/abs/qalg/9707011v1
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The relationship between the exactness of a first order differential calculus on a comodule algebra $P$ and the Galois property of $P$ is investigated.
Source: http://arxiv.org/abs/qalg/9708014v1
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A. Iomin; S. Dorfman; L. Dorfman
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A growth of malignant neoplasm is considered as a fractional transport approach. We suggested that the main process of the tumor development through a lymphatic net is fractional transport of cells. In the framework of this fractional kinetics we were able to show that the mean size of main growth is due to subdiffusion, while the appearance of metaphases is determined by superdiffusion.
Source: http://arxiv.org/abs/qbio/0406001v1
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S. M. Perepelytsya; S. N. Volkov
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The vibrational dynamics of a DNA molecule with counterions neutralizing the charged phosphate groups have been studied. With the help of elaborated model the conformational vibrations of the DNA double helix with alkaline metal ions have been described both qualitatively and quantitatively. For the complexes of DNA with counterions Li+, Na+, K+, Rb+ and Cs+ the normal modes have been found, and a mode characterized by the most notable ion displacements with respect to the DNA backbone has been...
Source: http://arxiv.org/abs/qbio/0412022v1
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I propose here a new concept of information based on two relevant aspects of its expression. The first related to the undeniable fact that the expression of information modifies the physical state of its receiver. The second to the arbitrariness of such physical changes. In fact, these changes are not deducible from physical laws but from a code established arbitrarily. Thus, physical information is proposed here as the capacity of producing arbitrary changes. Once defined physical information...
Source: http://arxiv.org/abs/qbio/0609028v1
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Mai Suan Li; Maksim Kouza; ChinKun Hu
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The refolding from stretched initial conformations of ubiquitin (PDB ID: 1ubq) under the quenched force is studied using the Go model and the Langevin dynamics. It is shown that the refolding decouples the collapse and folding kinetics. The force quench refolding times scale as tau_F ~ exp(f_q*x_F/k_B*T), where f_q is the quench force and x_F = 0.96 nm is the location of the average transition state along the reaction coordinate given by the endtoend distance. This value is close to x_F = 0.8...
Source: http://arxiv.org/abs/qbio/0611080v1
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Jonathan L. Belof
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The didemnins represent a versatile class of depsipeptides of marine origin and hold a great deal of potential for biomedical application. The biological and geographical origins of the didemnins are reviewed in addition to the chemical structures of the major didemnins. The biological mechanisms behind the antiviral and anticancer effects of selected didemnins are summarized and the special case of dehydrodidemnin B (Aplidin) is expounded upon including structural characteristics, synthesis,...
Source: http://arxiv.org/abs/qbio/0612040v1
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Ph. Blanchard; R. Olkiewicz
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Notions of robust and "classical" states for an open quantum system are introduced and discussed in the framework of the isometricsweeping decomposition of trace class operators. Using the predictability sieve proposed by Zurek, ``quasiclassical'' states are defined. A number of examples illustrating how the ``quasiclassical'' states correspond to classical points in phase space connected with the measuring apparatus are presented.
Source: http://arxiv.org/abs/quantph/0003103v1
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X. X. Yi; C. P. Sun
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The stability of BoseFermi gases trapped in an isotropic potentials at ultracold temperature is strongly influenced by the interaction between the fermions and the bosons. At zero temperature, the stability criterion is given in this paper using variation method, the results show that whether a fermionboson mixture is stable depends mainly on the interaction between the fermions and the bosons. For finite temperature, however, the stability is not only related to the coupling constants, but...
Source: http://arxiv.org/abs/quantph/0003110v1
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Mario A. Castagnino
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The importance of the global nature of the arrow of time is shown. Classical Reichenbach diagram and quantum BohmReichenbach diagram, for the universe are introduced. They are used to show the increase of entropy in closed systems, the global nature of the quantum measurement, and the relation among the different arrows of time.
Source: http://arxiv.org/abs/quantph/0005077v1
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A. Lezama; G. C. Cardoso; J. W. R. Tabosa
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Nearly degenerate fourwave mixing (NDFWM) within a closed degenerate twolevel atomic transition is theoretically and experimentally examined. Using the model presented by A. Lezama et al [Phys. Rev. A 61, 013801 (2000)] the NDFWM spectra corresponding to different pump and probe polarization cases are calculated and discussed. The calculated spectra are compared to the observation of NDFWM within the $6S_{1/2}(F=4)\to 6P_{3/2}(F=5)$ transition of cesium in a phase conjugation experiment using...
Source: http://arxiv.org/abs/quantph/0005096v1
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Marek Kus; Karol Zyczkowski
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Geometric properties of the set of quantum entangled states are investigated. We propose an explicit method to compute the dimension of local orbits for any mixed state of the general K x M problem and characterize the set of effectively different states (which cannot be related by local transformations). Thus we generalize earlier results obtained for the simplest 2 x 2 system, which lead to a stratification of the 6D set of N=4 pure states. We define the concept of absolutely separable...
Source: http://arxiv.org/abs/quantph/0006068v3
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The biological hierarchy and the differences between living and nonliving matter are considered from the standpoint of quantum mechanics.
Source: http://arxiv.org/abs/quantph/0007023v1
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Karol Zyczkowski; Pawel Horodecki; Michal Horodecki; Ryszard Horodecki
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A model of discrete dynamics of entanglement of bipartite quantum state is considered. It involves a global unitary dynamics of the system and periodic actions of local bistochastic or decaying channel. For initially pure states the decay of entanglement is accompanied with an increase of von Neumann entropy of the system. We observe and discuss revivals of entanglement due to unitary interaction of both subsystems. For some mixed states having different marginal entropies of both subsystems...
Source: http://arxiv.org/abs/quantph/0008115v3
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L. Horvath; B. C. Sanders
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We show that shifts in locations of twophoton coincidence spectral peaks, for a bichromaticallydriven twolevel atom passing through a singlemode cavity, are due to competition between excitation pathways for a JaynesCummings system. We also discuss an analogous shift of (singlephoton) spectral peaks for a driven threelevel Vsystem, which demonstrates that competition between excitation pathways is also important in this simple system.
Source: http://arxiv.org/abs/quantph/0011079v4
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Harry Buhrman; Richard Cleve; John Watrous; Ronald de Wolf
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Classical fingerprinting associates with each string a shorter string (its fingerprint), such that, with high probability, any two distinct strings can be distinguished by comparing their fingerprints alone. The fingerprints can be exponentially smaller than the original strings if the parties preparing the fingerprints share a random key, but not if they only have access to uncorrelated random sources. In this paper we show that fingerprints consisting of quantum information can be made...
Source: http://arxiv.org/abs/quantph/0102001v1
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G. Gilbert; M. Hamrick
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An undetected eavesdropping attack must produce count rate statistics that are indistinguishable from those that would arise in the absence of such an attack. In principle this constraint should force a reduction in the amount of information available to the eavesdropper. In this paper we illustrate, by considering a particular class of eavesdropping attacks, how the general analysis of this problem may proceed.
Source: http://arxiv.org/abs/quantph/0106034v2
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Miklos Redei; Stephen J. Summers
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If \{A(V)\} is a net of local von Neumann algebras satisfying standard axioms of algebraic relativistic quantum field theory and V_1 and V_2 are spacelike separated spacetime regions, then the system (A(V_1),A(V_2),\phi) is said to satisfy the Weak Reichenbach's Common Cause Principle iff for every pair of projections A \in A(V_1), B \in A(V_2) correlated in the normal state \phi there exists a projection C belonging to a von Neumann algebra associated with a spacetime region V contained in the...
Source: http://arxiv.org/abs/quantph/0108023v1
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Egilberto Lombardi; Fabio Sciarrino; Sandu Popescu; Francesco De Martini
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We report the experimental realization of teleporting an entangled qubit. The qubit is physically implemented by a twodimensional subspace of states of a mode of the electromagnetic field, specifically, the space spanned by the vacuum and the one photon state. Our experiment follows along lines suggested by H. W. Lee and J. Kim, Phys. Rev. A, 63, 012305 (2000) and E.Knill, R.Laflamme and G.Milburn Nature 409: 46 (2001).
Source: http://arxiv.org/abs/quantph/0109160v1
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We prove a general limitation in quantum information that unifies the impossibility principles such as nocloning and noanticloning. Further, we show that for an unknown qubit one cannot design a universal Hadamard gate for creating equal superposition of the original and its complement state. Surprisingly, we find that Hadamard transformations exist for an unknown qubit chosen either from the polar or equatorial great circles. Also, we show that for an unknown qubit one cannot design a...
Source: http://arxiv.org/abs/quantph/0111153v3
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The timeenergy uncertainty relation is discussed for a relativistic massless particle. The Lorentzinvariant uncertainty relation is obtained between the rootmeansquare energy deviation and the scatter of registration time. The interconnection between this uncertainty relation and its classical analogue is established.
Source: http://arxiv.org/abs/quantph/0201113v1
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Lasers essentially consist of singlemode optical cavities containing twolevel atoms with a supply of energy called the pump and a sink of energy, perhaps an optical detector. The latter converts the light energy into a sequence of electrical pulses corresponding to photodetection events. It was predicted in 1984 on the basis of Quantum Optics and verified experimentally shortly thereafter that when the pump is nonfluctuating the emitted light does not fluctuate much. Precisely, this means...
Source: http://arxiv.org/abs/quantph/0201151v1
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Xinhua Peng; Xiwen Zhu; Ximing Fang; Mang Feng; Xiaodong Yang; Maili Liu; Kelin Gao
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The remarkable capability of quantum Fourier transformation (QFT) to extract the periodicity of a given periodic function has been exhibited by using nuclear magnetic resonance (NMR) techniques. Two separate sets of experiments were performed. In a full QFT, the periodicity were validated with state tomography and fidelity measurements. For a simplified QFT, the threequbit pseudopure state was created by introducting an additional observer spin, and the spectra recorded on the observer spin...
Source: http://arxiv.org/abs/quantph/0202010v1
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Sang Pyo Kim; Ademir E. Santana; F. C. Khanna
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Quantum dissipation is studied within two model oscillators, the CaldirolaKanai (CK) oscillator as an open system with one degree of freedom and the BatemanFeshbachTikochinsky (BFT) oscillator as a closed system with two degrees of freedom. Though these oscillators describe the same classical damped motion, the CK oscillator retains the quantum coherence, whereas the damped subsystem of the BFT oscillator exhibits both quantum decoherence and classical correlation. Furthermore the amplified...
Source: http://arxiv.org/abs/quantph/0202089v1
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A. Hutton; S. Bose
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We investigate the differences between distributing entanglement using star and ring type network topologies. Assuming symmetrically distributed users, we asses the relative merits of the two network topologies as a function of the number of users when the amount of resources and the type of the quantum channel are kept fixed. For limited resources, we find that the topology better suited for entanglement distribution could differ from that which is more suitable for classical communications.
Source: http://arxiv.org/abs/quantph/0202116v1
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G. P. Berman; D. I. Kamenev; V. I. Tsifrinovich
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We consider theoretically the novel technique in magnetic resonance force microscopy which is called ``oscillating cantileverdriven adiabatic reversals''. We present analytical and numerical analysis for the stationary cantilever vibrations in this technique. For reasonable values of parameters we estimate the resonant frequency shift as 6Hz per the Bohr magneton. We analyze also the regime of small oscillations of the paramagnetic moment near the transversal plane and the frequency shift of...
Source: http://arxiv.org/abs/quantph/0203013v1
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T. B. Pittman; B. C. Jacobs; J. D. Franson
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We describe the results of a parametric downconversion experiment in which the detection of one photon of a pair causes the other photon to be switched into a storage loop. The stored photon can then be switched out of the loop at a later time chosen by the user, providing a single photon for potential use in a variety of quantum information processing applications. Although the stored single photon is only available at periodic time intervals, those times can be chosen to match the cycle time...
Source: http://arxiv.org/abs/quantph/0205103v1
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M. Keyl; R. F. Werner
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The theory of quantum error correction is a cornerstone of quantum information processing. It shows that quantum data can be protected against decoherence effects, which otherwise would render many of the new quantum applications practically impossible. In this paper we give a self contained introduction to this theory and to the closely related concept of quantum channel capacities. We show, in particular, that it is possible (using appropriate error correcting schemes) to send a nonvanishing...
Source: http://arxiv.org/abs/quantph/0206086v1
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L. M. Duan; A. Kuzmich; H. J. Kimble
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We propose a method to implement cavity QED and quantum information processing in highQ cavities with a single trapped but nonlocalized atom. The system is beyond the LambDick limit due to the atomic thermal motion. Our method is based on adiabatic passages, which make the relevant dynamics insensitive to the randomness of the atom position with an appropriate interaction configuration. The validity of this method is demonstrated from both approximate analytical calculations and exact...
Source: http://arxiv.org/abs/quantph/0208051v1
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By means of a simple example it is demonstrated that the task of finding and identifying certain patterns in an otherwise (macroscopically) unstructured picture (data set) can be accomplished efficiently by a quantum computer. Employing the powerful tool of the quantum Fourier transform the proposed quantum algorithm exhibits an exponential speedup in comparison with its classical counterpart. The digital representation also results in a significantly higher accuracy than the method of optical...
Source: http://arxiv.org/abs/quantph/0208063v3
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Alfredo M. Ozorio de Almeida
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The Lindblad equation governs general markovian evolution of the density operator in an open quantum system. An expression for the rate of change of the Wigner function as a sum of integrals is one of the forms of the Weyl representation for this equation. The semiclassical description of the Wigner function in terms of chords, each with its classically defined amplitude and phase, is thus inserted in the integrals, which leads to an explicit differential equation for the Wigner function. All...
Source: http://arxiv.org/abs/quantph/0208094v1
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Much long before the appearing time of the Comment by Cen, Li, and Yan,, the main issue addresed there by Cen et al had been resolved already. The information offered by the Comment is selective and misleading.
Source: http://arxiv.org/abs/quantph/0209059v1
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JinYuan Hsieh; CheMing Li; DerSan Chuu
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As the matching condition in Grover search algorithm is transgressed due to inevitable errors in phase inversions, it gives a reduction in maximum probability of success. With a given degree of maximum success, we have derive the generalized and imroved criterion for tolerated error and corresponding size of quantum database under the inevitable gate imperfections. The vanished inaccurancy to this condition has also been shown. Besides, a concise formula for evaluating minimum number of...
Source: http://arxiv.org/abs/quantph/0209073v5
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Hess and Philipp have constructed what, they claim, is a local hidden variables model reproducing the empirical predictions of quantum mechanics. In this paper explicit expressions for the conditional probabilities for the outcomes of the measurements at the two detectors are calculated. These expressions provide a conclusive demonstration of the falsity of the authors' claim. The authors give two different accounts of their model. The published version omits a crucial detail. As a result it...
Source: http://arxiv.org/abs/quantph/0210145v1
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Carlo A. Trugenberger
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I review and expand the model of quantum associative memory that I have recently proposed. In this model binary patterns of n bits are stored in the quantum superposition of the appropriate subset of the computational basis of n qbits. Information can be retrieved by performing an inputdependent rotation of the memory quantum state within this subset and measuring the resulting state. The amplitudes of this rotated memory state are peaked on those stored patterns which are closest in Hamming...
Source: http://arxiv.org/abs/quantph/0210176v2
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A. M. Lance; T. Symul; W. P. Bowen; T. Tyc; B. C. Sanders; P. K. Lam
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We present two experimental schemes to perform continuous variable (2,3) threshold quantum secret sharing on the quadratures amplitudes of bright light beams. Both schemes require a pair of entangled light beams. The first scheme utilizes two phase sensitive optical amplifiers, whilst the second uses an electrooptic feedforward loop for the reconstruction of the secret. We examine the efficacy of quantum secret sharing in terms of fidelity, as well as the signal transfer coefficients and the...
Source: http://arxiv.org/abs/quantph/0210188v1
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